Allegiant Air carry-on size and weight in 2026
Allegiant Air (USA, IATA code G4) allows cabin bags up to 55.88 cm long, 40.64 cm wide and 25.4 cm deep; there is no separate weight limit as long as the bag fits the sizer.
The dimensions include wheels, handles and outer pockets. A soft bag can usually be squeezed a little, but a hard-shell suitcase cannot lose that extra centimetre — and that is exactly when gate staff ask you to pay.
Instead of guessing, open Kalibrator: pick Allegiant Air, enter the size of your suitcase or bag and see in 3D whether it fits the sizer and where exactly it sticks out.
Frequently asked questions
What is the Allegiant Air carry-on size?
Up to 55.88×40.64×25.4 cm (length × width × depth), including wheels and handles.
How much can Allegiant Air hand luggage weigh?
There is no separate weight limit; the item just has to fit the sizer.
How do I check whether my suitcase fits?
Open Kalibrator with Allegiant Air selected and enter three dimensions — the site shows your suitcase in a 3D sizer and tells you where it sticks out.
How accurate is this data?
The allowances come from the airline's official website (link below). Rules change from time to time, so check with the airline before your flight.